Trying to copy objects across scenes but it duplicates my scenes instead (BGE)
"L" means the data is linked. Typically it is linked from another file.

I never used ctrl+c and ctrl+v. Maybe because i usually do not copy objects between different scenes (but move them). I tried it and it worked as expected. So I cannot confirm the behavior you describe.

Another way to copy an object:

To get objects from one scene to another I suggest:


select the objects
link to the target scene ctrl+L Objects to Scene .../target scene
switch to the target scene
make single user U (Attention: the name will change)